Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2024	Jan. 03, 2023	Dec. 28, 2021
Income Tax Disclosure [Abstract]
Federal income tax (benefit) provision at federal rate	$ (2,065)	$ (688)	$ 784
State income tax (benefit) provision, net of federal tax	(420)	(112)	162
Other permanent differences	629	368	(17)
Tax credits	(1,513)	(1,608)	(1,297)
Change in valuation allowance	3,352	1,558	244
Tax rate change	0	0	6
Deferred tax asset write-off	78	320	207
Other items, net	(37)	199	(19)
Total provision for income taxes	$ 24	$ 37	$ 70
Effective income tax rate	(0.20%)	(1.10%)	1.90%